electrical engineering MCQs – Page 121

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

2401. The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ______________?
0

A. 1000:01:00

B. 40,000 : 1

C. 100:01:00

D. 1:01

2402. An emitter follower has ______________input impedance?
0

A. Zero

B. None of the above

C. Low

D. High

2403. The total resistance of a parallel circuit is 50 ?. If the total current is 120 mA, the current through the 270 ? that makes up part of the parallel circuit is approximately_______________?
0

A. 50 mA

B. 22 mA

C. 220 mA

D. 120 mA

2404. If the value of a is 0.9, then value of is___________?
0

A. 9

B. 0.9

C. 90

D. 900

2405. When a negative voltage feedback is applied to an amplifier, its bandwidth_____________?
0

A. Is increased

B. Is decreased

C. Remains the same

D. Insufficient data

2406. In a phase shift oscillator, the frequency determining elements are _______________?
0

A. None of the above

B. L and C

C. R and C

D. R, L and C

2407. The temperature inside a furnace is usually measured by which of the following ?
0

A. Mercury thermometer

B. Any of the above

C. Optical pyrometer

D. Alcohol thermometer

2408. The material of the heating element for a furnace should have___________?
0

A. high specific resistance

B. lower melting point

C. all of the above

D. higher temperature coefficient

2409. Hysteresis loss and eddy current loss are used in____________?
0

A. induction heating of brass

B. dielectric heating

C. induction heating of steel

D. resistance heating

2410. Which of the following devices is necessarily required for automatic temperature control in a furnace ?
0

A. Thermocouple

B. Heating elements of variable resis-tance material

C. Thermostat

D. Auto-transformer

2411. The voltage gain of an emitter follower is _____________?
0

A. Approximately equal to 1

B. None of the above

C. Greater than 1

D. Much less than 1

2412. An oscillator produces___________oscillations?
0

A. Modulated

B. Damped

C. None of the above

D. Undamped

2413. When earth fault occurs______________?
0

A. voltage potential at the earth mat decreases due to grounding

B. voltage potential at the earth mat remains zero irrespective of fault

C. voltage potential at the earth mat increases due to grounding

D. none of the above

2414. Generally grounding is provided for
0

A. only for the safety of the equipment

B. only for the safety of the operating personnel

C. both (A) and (B)

D. none of the above

2415. In a transistor if = 100 and collector current is 10 mA, then IE is___________?
0

A. 100 mA

B. 110 mA

C. 100.1 mA

D. none of the above

2416. A heat sink is generally used with a transistor to______________?
0

A. decrease the forward current

B. increase the forward current

C. prevent excessive temperature rise

D. compensate for excessive doping

2417. Three lights are connected in parallel across a 120 volt source. If one light burns out_____________?
0

A. the remaining two will glow dimmer

B. the remaining two will glow with the same brightness as before

C. the remaining two will not light

D. the remaining two will glow brighter

2418. The PIV rating of each diode in a bridge rectifier is ___________that of the equivalent center-tap rectifier?
0

A. one-half

B. four times

C. the same as

D. twice

2419. Five 100 ? resistors are connected in parallel. If one resistor is removed, the total resistance is______________?
0

A. 25 ?

B. 500 ?

C. 100 ?

D. 20 ?

2420. Induction heating takes place it which of the following ?
0

A. Insulating materials

B. Conducting materials which are non-magnetic

C. Conducting materials which are magnetic

D. Conducting materials which may or may not be magnetic

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